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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4194c886fcb27631c1c4095b462f42cfb01ee3d0970f9d95c036d825c702d8' 
  AND token = 'LXQUSDDPgckg7k6C3T0VfbM9FogqXXIzBVkJaVEut6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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