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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67740903f69de5e8c223157f62edfe4dd32ed7d77e1cf1f25083011a5d0f70b' 
  AND token = '8KA1DngQiAad/5lagbwlLcGDhRPglysjBJQnNdm38yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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