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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1379b0f939e6327c79540682301ec544a557cca1ef4998be480f1695543ad39' 
  AND token = 'vNk8vZXhQC63+Nv14K0NZfRWhCwyU6j3QOdQJ6o47mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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