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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0d52b7c1d67b3e3d47bd51381431850905dac122d6337d06b3520786d6c110' 
  AND token = 'E1DhnZWlJsn7wC5hVUumJdRKjHeUEngJGujuviLjR84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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