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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd02e0aac9efcee8d7c9271ff364b8e9ad2fa0fc2410be96d19c1bd064295e60' 
  AND token = '7sB9sMbQbXe6StIGuDMsT9RtIvW4r6e5K534xT43i+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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