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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd3210b6449089deb0a0c36cceb1f9bda04e02ad08d05dc8294d0e8dc95adce' 
  AND token = 'y4n8qxdd5qas0R+Zk6GwHTjcYFdvpjh6/tz0vfArPXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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