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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c371ded17261d1ea987a1238b21774c4652f654b666c2ef77e92e2148277d1' 
  AND token = 'asSxyTfYeDCAykeXN1bECrZ14Wp5hWl4A9KnkdnCINY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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