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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a011edfb82efe6b50346a97651e53bafe18b0473dd191aeea395608ef5c4398f' 
  AND token = 'pdFqlJhyF7ikLB05+Bnu442lrk5iMG2mRPj97wlyDT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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