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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4eeb697387fe0c02be7a1e1df71fff40cee6cf874944076cb12f8a0211fe45' 
  AND token = 'EmPg/wriZOy0DzprND9/pEF9Zy1TJkM+qs8ssniii8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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