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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1334a023f2b6f114d5ee54bd09506f5aead67616df74cb2134da66ccee3ef93' 
  AND token = 'f5pSIBKol3NoSChcUzkU31mW9rt/2phlAg/JJ6Flh2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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