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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a4ef690723e90438ea703a7520eb353dac2c45ccc6e6d713977d38d3f63ff2' 
  AND token = '4To5N51WUjfMfdNUnZsX495oV++NCWXzmkbydYiua0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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