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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f629746f1f013089725c484acb0f2b5ae59a375d6b6e6184729d5258e394215' 
  AND token = '0cjWr463C5WjO7Mm30EuUCbBV73J5GIO5CKULKHe0kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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