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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88ecbbc9cc304f19056a3ced2c97b013d4f1685a7d6fed3e17ec1b4c2300ffa' 
  AND token = 'q8zFFWOvjakM010xmTI8aX8UxkLGILmIJEkbcHtflDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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