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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a848954497b8243ed41cc7937a0f1bd25bac00e364ece19e7a7afaacbbc6fb' 
  AND token = 'SSjNg/O7std+0UQEL5NTn3EzVbqbAuWynnUqAtjlAHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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