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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7df5bb79f7686c81b4c2ce3b4992c6cc93ac06f884e3fba220dda4eac4ffb2' 
  AND token = 'Ta7wnellJW5AnFniyHSH4po8xOo0ocszBq5ZiAd3KfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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