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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd860ec91ed19d9b67eb15b08c9a951a06ce11f5323045cd16fc6e4f39a8068f5' 
  AND token = 'tfnPjNh/9Ksxu9PICZADk3L3I/kGlboDdU7RJu/Wtl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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