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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9622fa2bbdb515317c1ee42b5af1bdb481f1749d77d10c5c67765893589a41d1' 
  AND token = 'KN6IomWzxIXhe5m55wSSClNXCGHZY1lX+/wwadO4Who=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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