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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15246bd33d4345e85b62409200486ca4c0cfe0647a11826df0812a8b53bf8a9' 
  AND token = 'f162CZ/UDOM76ATn5hlxZrYP7/FJiQneO0eceF0sfs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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