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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc3c07acae4237b1b8bd50e44967f81d99b7605dab1760654bea76eb3934783' 
  AND token = '7933az34EfbEdDJGS6FthskXhqJ7LU8EXpI8pCq/9RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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