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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033bc7a3893c925e767cc5055892fb73293bfbc7e01a1b09238c24527e7ea27f' 
  AND token = 'e120M57rUss8raVH7oR+suNe9uLeX7NObuYXkzyJWlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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