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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b769fcba6fd37d226030aa2e4e76159bf2ca336252707880b3de32231e48727' 
  AND token = '87UOhzxXoqGU3Kj2HxtMMGs0+9q5v10LIK6WyzhUFnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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