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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26da0a1073293c830d44e2099445b4168a348384ec1913b3356a7f8fde62581c' 
  AND token = '0itd2YDcZHLEsWPPsvQ7xA0jWjHbJJ8GOJwP0HDobAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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