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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bcb75f199e048494618d84bc60c167b4e9ac394f1cf33a5ed85f03dfb235cc' 
  AND token = 'ge8nuZzrcNoNf6hMibBVGYYJlG9+x7nso9DsDPRO0cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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