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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b927ace04ff4211c001c35ba5bd5d2f9ef25f5140fb73b6d67ef89cab7f30ce' 
  AND token = 'PTRZuk2Qf29sNQlT7CKTJYkcH8Xgb85BjIkOLNNYvEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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