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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a38183b388340a7e360dcf7668562be3b4e92722459cff91bb1fab63fb8a919' 
  AND token = 'wyeH0HFHt3CwAB/C68hW4TX0ftAawTVw2zGgPrcNPE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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