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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41cbb48787687c8b3bd8cb3c28dc10dfb17d1c9f864ac2fe063049ef6c7e661' 
  AND token = '0i2XZLbclue0MfMs7QqDd84Rjg/RGNnMod6iyEjzhhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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