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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2fb8299602cc5fc51e53a8747dd840d1ef82a337c718cf97f7e45f7fd58328' 
  AND token = '3HrsPZLkG5siUF3H34Kdae9srNEDEML+miLRzo/bbQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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