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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addfa6c9750ce76046bced8b2983802aa95219d004bdd738d80013aef09d74e3' 
  AND token = 'CMsHZ3Ouf4JhI6XmeU/4ERNuifiQI3m76hvHFXYISHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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