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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4387eef2f360273014dfa888656a1935b66a0f650829d4d6cdd6b6a7f36dc325' 
  AND token = 'j0TgdfCB7eZNajppyHaZqwh4iRJsPcRK1x38cm8XKdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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