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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ce3d491649b65c6a24c398b63c97ac5bfef93bde30de6bb56b918871ea7ecb' 
  AND token = '/TRIckTO45HYGIKiuWyhNuj8PUFsm9ULAgW+g9dDmXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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