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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5942efe3612a9073efc297fcfdd7cbeeea831818396888eb9dabd0263b31fddd' 
  AND token = '8lFx+JWIPp0NRuoHOvi4PeAGT4dPE1UveCZyOTtm/Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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