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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97eb24c946b070cdb3a80bd13e37339d7459cd3172ae2b1331b2df42e2311add' 
  AND token = 'SEceuREtLwzya/Zkd6LbHL49wNuNjeWRaYxecCh3RhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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