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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3dd2d07306d51c9a7d71cdd19e6e5792d4c4684ed1d1660b4dbbc33272ecdd8' 
  AND token = 'cXY0tBOogkvuzaSFRxUC+/qNxt1vglqlhEKf6UxK36E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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