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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968da0025ed1323ca83507d726ef214d628c5f2e26dca1ce1a3202766c9a4786' 
  AND token = 'H93Hd3MeeFTeh1Syz3IpX44xufkKch5ZE2gxtT6MIps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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