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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a308fc9a286e763b93bcc0ccba67ac5962b7323df97666dc098e29fb09a9bac' 
  AND token = '9WS3+z0OabyPCxap4X1iG09G6ROxuIcOICMDzPBJ2FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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