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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788c73614ab9d71fa1ae273b9a594e6a6da30449ff52024999fd657f79c9dbab' 
  AND token = '0mS8yPppq/GFgqi8yoWFplxXokprlfmmJ6bAXll/Lnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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