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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d38a755e36c0b98d99c5cc42e6cc6b4ce47871d6558557b78bb2929e84ca8d1' 
  AND token = 'HfOrt46n6plCJQDbG1rXEYjQiFlJPCacSEWZyD1OqXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}