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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1d4ce8b76ddfc163f865bdf32174fc8c3250295483535e99b3f1f689ead876' 
  AND token = 'Yo2CjjD47iFsuVeWc86Mm64GUCMXVXNMbAPjsnSrMTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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