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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c2ab14e5d500845999ddd99bece8bea8331c7d79637191e8082e0e65a9958c' 
  AND token = 'k34lcdhh+AA5Bs6l9GKQSYg1xonUNJ3+UM/rEnTOzPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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