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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc4b4d541580b2df4208a98b6622f77e7b1fe2a480cd1ee494f1bd87ab76154' 
  AND token = 'cG38G98MIrLcN6ll0ZBAsG5HI4gGvdpcgikDAK0KKH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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