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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff4dbf8a3f9021cb30e9f4b3a8f1a09939376b15dfdea0004eceed9020b0ff6' 
  AND token = 'sXVlSN4vxcB2y3eYhikKm5d5Jpo7UZ6ptwm2/1sHQjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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