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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190289c85f188264bb4b505e7ad2aa0c02722e0505f40020cfb6a9152bdabd17' 
  AND token = 'u53h4Im6hbS4teA3K3liiITq5kELbTFMfjBfSLlV0iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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