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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ecc8b8b1bfeb6c2d9c1bd9dec445a4f7d57f97448b88eb3a78ef9af685e554' 
  AND token = 'CJoUCmTf6W7BaavmIC5yjby3vrTwGccwrnQ8pIiy5hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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