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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4ef026fa31eddcaf6e49f995deae9736e6413a5b8965cc8d5340163c7d4f84' 
  AND token = 'zo3r1E7/LT2sf/EXtM0N/U5WS72N6PTwFOrHM3+zJT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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