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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a3eeca84ea58b81d09a6d8674268d2c8855914f658dd64886844702186b368' 
  AND token = 'kAIHeZHBRLF9Nrsuo/FlrnSEs+ddAhhnORB2OWQVcxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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