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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c75c8fb4514f2ef547162982a5fb2cae6f0b3d7e4309609165940eff207cfe7' 
  AND token = 'h/WgSN49m4XprEqih9wdCZsScAP0fu+c9Wu9nEH7yFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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