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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bde95dfc3cf30f5ed69433612eef7e041820104bf1dd73c7472568675b793dd' 
  AND token = 'olO9wGb3079E+Ohhus0+FYHgWUGDvu4QRivrZYgl3C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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