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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddbe51778e7eaa4f0e6b60e3f0a040428f637fc4698b199289c257c3e9f95b6' 
  AND token = 'faF1TCF1CEcikw/st/oRJ/K2IT0/rtFucw1f+u9OpkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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