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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847c494fb8aa6979d31c89049c7e712dfcf64cb49d3dbbbb8282b7da50e1f69a' 
  AND token = 'r0s8+KAOPLYKua+Upwws+OxG4KuG9Q65XH8TrL4vH7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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