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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c40449ad25d8b7540a629786420b4da4d123edd04925600fc10aee840328d8' 
  AND token = '0WtvYnbY+SdxBc+VBpWczg89t0p1g3ptRMWhbs5vOgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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