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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e2f83f65cd355f2f67ab2a615707bd0965f28d205230eca63bf70c362cafc0' 
  AND token = 'y9TMHPM1VFId2nO8t9kmv69EYqapJT9MF8fHqWpWqOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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