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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b120b5ccb585128712b1a5972174079c659ba513f6cdb634266613267b8f2664' 
  AND token = 'ArA53ZGPMfnnq9oreUIyXaZWpcRXn/Jmazas9VbPxYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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