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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128508e8dabe967de012aef5a996c11ec57d6e52e21735809b83a13223b9112a' 
  AND token = 'TIaR3AZqJtEilkLdbRWo5CG7RlmaEV+pvGz9jb6Pv6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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