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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2eea021d356adfe7e94ec8a4a4824515a8c63d7f220c5f57931f731185f2a9' 
  AND token = 'lqfL7aC6nGOh5KclkNMrwc4tR+ozyMj79W6CcYJ2Dt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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