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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02a99b4b0392c4cb9699440776062b296f8d859b607854431a58bea07420000' 
  AND token = 'SJgYWHOZVX7zT/M4WzyOPdKidfHpiPOioB40qmAfNuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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