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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5715901a2f1eacb0673faacf83d555cd62c8f39cbdf73302bd58f2a7aa465be2' 
  AND token = '+Tuk20bhlvAEpcPWEtShNbWY8/SV9+GEJ6SnHTXjBPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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