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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e495443989cffc33b23f37bc4fc09a44fb98f95e0d0f91ca00382aa118540' 
  AND token = 'EWElrQUdYTEB9Un8WPlYo+T+GgHnFB/+TpCF2dNPS3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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