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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4666d96a4aa0d02f586667c5de1fbbbe49de4bd8d2d0f45e0c96926feb5cd3c' 
  AND token = 'pMDAcVR2826SfSrDItvgiQ/VJsmQFN0lR0dgJPlISsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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